I should contribute something more valuable to this conversation, but 'sadly' I have the absolute same opinion about Blizzard as you do, so there is not much to discuss.
Just to make you more angry, though... I am sure that Diablo 3 will have expensive DLC; very expensive, I bet. And if its not very expensive, it WILL be when you have to buy ALL of it to keep up with the other players. And guess what, it is also an MMORPG when you play it online, so there is even more potential for even more content for even more money! Hooray.
Hey hey, guess what!? Warcraft 4 might actually come out some day! Haha, wait, who am I kidding? How many players are longing for Warcraft 4? Oh, thats right, a gazillion! Great great, so if they make the game and sell it for $60, Blizzard will have tons of money!
"Aww... Tons of money is not enough... How many playable races did Warcraft 3 have again? Undead...Human... Night elves...Wait, that's THREE races.... So, if we just rewrite the story and make it a bit longer and stuff it with a lot of horrible filler in, we can actually... We could... OMG!!!
Hey guys, how would you like it if we split up Warcraft 4 into three parts?!?!?! Imagine how much money that will bring us! Look at those idiots that bought Starcraft 2, they would do that again!!!!
Haha, good thing we have such a stupid fanbase that enjoyed our game for its artistic value and technical standpoint back in the day. Remember how they praised us and said we were the best company ever because we were so different back then? Good thing that's over, because more money is more important than anything.."
Honestly though, I can't blame them. The fanbase is satisfied even after they sold Starcraft 2 Part 1 for $60. Why not do it then?
Now, if everyone was NOT satisfied, theeeen maybe Blizzard would think about it.... And decide to do it again.